Now that we have the central atom and the total valence electron number, we will find out how the electrons are located to reach the octet configuration( i.e. If you go by the periodic table, we know that xenon is less electronegative than fluorine, hence it will take up the position of a central atom. Total number of valence electrons =8 + 7*2 = 22 ![]() Fluorine is a halogen belonging to group VII, therefore it has a valency of seven. Therefore, it has eight valence electrons. We use dots to represent outer shell electrons and lines to represent the bond type. Lewis Structure, also known as electron dot structure, is an essential model of chemical bonding where we use the valence electron concept to schematically sketch a two-dimensional figure of a given molecule. If you go through the periodic table, the groups will help us find out the valence electron number of a certain atomic element.įor example, Carbon is in group 4 (also called Group XIV), hence the valence shell consists of four electrons. ![]() Valence electrons signify the outermost shell electrons of an atom that determine its valency. The very first thing to learn when we are into chemical bonding is the concept of valence electrons. This is known as chemical bonding which is the backbone to define the internal structure and nature of a given molecular compound including the properties it exhibits( both physical and chemical).īefore we jump directly into the chemical bonding of XeF2 in this article, we would like you to learn and recapitulate certain important terminologies and concepts. This formation of molecules happens via the creation of certain bonds which hold the atoms together according to their strength. When two or more atoms come together they react and combine to form homogeneous and heterogeneous molecules.
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